Gordon mokat



UNITED STATES PATENT OFFICE;

GORDON MGKAY, OF BOSTON, AND LYMAN R. BLAKE, OF QUINOY, MASS.

CHANNELING-MACHINE.

Specification forming part of Letters Patent N0. 43,92 3, dated August 23, 1864.

l ble those skilled in the art to practice it.

Our invention relates to channeling-in achines generally, but more particularly such as are organized to form channels in boot and shoe soles in which pegs, nails, and stitches which unite the parts are covered from sight, examples of which machines may be found upon reference to the patent granted to Martin Wesson, May 24, 1859,; to the patent granted to Gordon McKay, April 5,1864, and to the Patent granted to Curtis Stoddard, April 5, 1864, all of which patents are owned by Gordon McKay, one of the applicants herein. In said patented channeling-machines it is difficult to turn short corners-like those of the toe of a sole, for example-the sole being pinched between the lower feed-wheel,

which is provided with teeth and an upper feed and presser roll. The teeth of the feedroll are embedded in the leather and short corners are turned by using the sole as a lever and twisting it upon the teeth, which tears and disfigures the stock. To remedy this ditiiculty is the object of one part of our invention, which consists in so applying a spring to act in conjunction with lthe feed wheel that when pressure is exerted upon the sole from above the spring will be depressed with reference to the teeth of the feed-wheel, allowing them to project a considerable distance above the upper or bearing surface of the spring, and so that the teeth will penetrate the stock and have a good hold thereupon by pressing the sole down upon the teeth, and so that when pressure is removed from the stock the reaction of the spring will lift'the stock o' from the feed-teeth and hold it by simple pressure between two smooth surfaces, the top of the spring and the lower edge of the presser-roll. In this condition avery sharp corner can be turned by the sole using it as alever, and the facility with which the sole can be guided or turned, will depend upon the amount of hold which the teeth have on the sole.

In former channeling mechanisms, to vary the depth of the channel it was necessary to change the adjustment of the knife with reference to that part to which the knife was scoured, and as this is a matter of some trouble, and as the operator dislikes to change the fastening of .his knife when it is so set as to operate well, it is an object of some importance to be able to alter the depth of the channeling without disturbing the set or adjustment ofthe knife; and in the means by which we accomplish this may be found the second part of our invention, which consists in making the presser-foot adjustable upon the head or lever which carries the knives, and with reference to the knives, so that when the presser foot is adjusted upward the knife or knives are allowed to cut to greater depth, and when the adjustment of the presser-foot is downward the channel is cut shallower.

In the drawings, Figure 1 shows in side elevation a channelingmachine embodying our invention, and Fig. 2 shows in front view or elevation that partof the machine which embodies the invention, part of the presserwheel being represented as removed to show details beyond.

a is the lower feed-roll; b, the upper feed presser-roll; c, the pivoted lever to which the roll b and knives d e are secured, allarranged as shown in some of the patents before referred to.

Above the surface of the wheel a, and beneath the knives, a spring, f, is located, one end being free and the other iixed to the frame of the machine, as shown in the drawings.

It will be obvious that hold of the teeth of the feed-wheel a can only be had upon the leather when this is pressed downward from above, so as to depress sprin gf, and that when little or no pressure is so exerted the leather v inives relatively to the lever c is effected by giving tothe le ver 0a capability oflongitudiiai movement, so as to carry the knives to- .vard or away from the edge guide-roll h. lhis is accomplished by making an elongated )caring-slot .in the lever, Where itis pivotedY io the main frame of the machine, and, applyng adjusting-screws to this slot and the pivot running through it, the lever can be set for- Nard or back, asmay be desired, and as will )e readily understood from Fig. l of the drawugs.

We claim- Y 1. The springf, when applied to operate in 

